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1/* $NetBSD: context.h,v 1.3 1995/09/28 10:34:17 tls Exp $ */
2
3/*
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)context.h 8.1 (Berkeley) 6/6/93
39 */
40
41#include <stdio.h>
42
43#ifndef EXTERN
44#define EXTERN extern
45#endif
46
47struct context {
48 struct context *x_link; /* nested contexts */
49 char x_type; /* tag for union */
50 union {
51 struct { /* input is a file */
52 char *X_filename; /* input file name */
53 FILE *X_fp; /* input stream */
54 short X_lineno; /* current line number */
55 char X_bol; /* at beginning of line */
56 char X_noerr; /* don't report errors */
57 struct ww *X_errwin; /* error window */
58 } x_f;
59 struct { /* input is a buffer */
60 char *X_buf; /* input buffer */
61 char *X_bufp; /* current position in buf */
62 struct value *X_arg; /* argument for alias */
63 int X_narg; /* number of arguments */
64 } x_b;
65 } x_un;
66 /* holding place for current token */
67 int x_token; /* the token */
68 struct value x_val; /* values associated with token */
69 /* parser error flags */
70 unsigned x_erred :1; /* had an error */
71 unsigned x_synerred :1; /* had syntax error */
72 unsigned x_abort :1; /* fatal error */
73};
74#define x_buf x_un.x_b.X_buf
75#define x_bufp x_un.x_b.X_bufp
76#define x_arg x_un.x_b.X_arg
77#define x_narg x_un.x_b.X_narg
78#define x_filename x_un.x_f.X_filename
79#define x_fp x_un.x_f.X_fp
80#define x_lineno x_un.x_f.X_lineno
81#define x_bol x_un.x_f.X_bol
82#define x_errwin x_un.x_f.X_errwin
83#define x_noerr x_un.x_f.X_noerr
84
85 /* x_type values, 0 is reserved */
86#define X_FILE 1 /* input is a file */
87#define X_BUF 2 /* input is a buffer */
88
89EXTERN struct context cx; /* the current context */